Question

请教一个单句改错：The policeman caught the thief by his arm.

4.The policeman caught the thief by his arm.

Answer 1

把his搞为the就可以了
动词catch,hit,punch之类的都用这个句型
catch sb. by the

Answer 2

我的理解：应把by改成in。

Answer 3

arms

Answer 4

the用在表示身体部位的名词前,表示所有，相当于物主代词：
She caught me by the arm.. 她抓住了我的手臂。